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Method for the operation of a drivetrainMethod for the operation of a drivetrain description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070287582, Method for the operation of a drivetrain. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001]This application claims priority from German Application Serial No. 10 2006 026 600.5 filed Jun. 8, 2006. FIELD OF THE INVENTION [0002]The invention concerns a method for the operation of a drivetrain of a motor vehicle, comprising at least an automatic transmission and a drive aggregate. BACKGROUND OF THE INVENTION [0003]The main components of a motor vehicle drivetrain are a drive motor and a transmission. A transmission converts torques and speeds and so transforms the traction force provided by the drive motor. The present invention concerns a method for the operation of a drivetrain which comprises at least a drive motor and an automatic transmission. In the context of the present invention, the term "automatic transmission" is understood to mean any transmission that effects automatic gear changes, these also being known as variable speed transmissions. [0004]From DE 100 35 479 A1, a method for operating an automatic transmission is known in which successive upshifts and successive downshifts can be carried out with some overlap in order to improve the shift speed. For this, during each first upshift or downshift, a shift element needed for the subsequent second upshift or downshift is prepared, while the first upshift or downshift is in progress, in such manner that when a synchronization point is reached, namely a synchronous speed of the first upshift or downshift in progress, the subsequent second upshift or downshift can be carried out immediately. [0005]In this way, according to DE 100 35 479 A1, single shifts are overlapped with one another, which means that each first upshift or downshift carried out and each subsequent second upshift or downshift is a single shift between two directly successive gears. [0006]The method known from DE 100 35 479 A1 can be used with an automatic transmission comprising five shift elements of which, for torque and force transfer in any forward gear and in a reverse gear, in each case two shift elements are engaged and three shift elements are disengaged. With such an automatic transmission, six forward gears can be engaged. In the development of automatic transmissions, however, a trend is perceptible towards constantly increasing the number of gears, in particular forward gears of the automatic transmission. Thus at present, automatic transmissions with eight forward gears and one reverse gear are being developed, such automatic transmissions having at least five shift elements such that, for torque or force transfer, at least three of these at least five shift elements are engaged in any forward gear and in a reverse gear while the other shift elements are disengaged. For such an automatic transmission, the method known from DE 100 35 479 A1 is not suitable. [0007]Starting from this, the present invention addresses the problem of providing a new type of method for the operation of a drivetrain comprising at least an automatic transmission and a drive motor. SUMMARY OF THE INVENTION [0008]According to a first embodiment of the invention, in an automatic transmission with at least five shift elements of which, for torque or force transfer in any forward gear and in a reverse gear, at least three shift elements are engaged and the other shift elements are disengaged, two respective consecutive upshifts or two respective consecutive downshifts can be carried out with overlap in such a manner that: [0009]a) when carrying out a first upshift or downshift, in accordance with a first alternative, a first shift element is disengaged or, in accordance with a second alternative, it is engaged and, in accordance with the first alternative, a second shift element is engaged or, in accordance with the second alternative, it is disengaged; [0010]b) while the first upshift or downshift is being carried out, with a view to a subsequent second upshift or downshift, a second shift element is prepared for disengaging in accordance with the first alternative or for engaging in accordance with the second alternative and a third shift element is prepared for disengaging in accordance with the first alternative or for disengaging in accordance with the second alternative; the second shift element, selected from a minimum number, in the first alternative, or a maximum number of shift elements, in the second alternative, is actuated on transition from the first upshift or downshift; [0011]c) while the first upshift or downshift is being carried out and while the second upshift or downshift is being carried out, at least one fourth shift element is kept engaged or nearly engaged. [0012]According to a second embodiment of the invention, in an automatic transmission with at least five shift elements of which, for torque or force transfer in any forward gear and in a reverse gear, at least three shift elements are engaged and the other shift elements are disengaged, while a first upshift or downshift is being carried out and with a view to a subsequent second upshift or downshift, a shift element that is to be engaged during the second upshift or downshift is prepared for engaging at a time that occurs before the synchronization point of the first upshift or downshift has been reached, by a time interval that can be applied in a time-controlled or in an event-controlled manner. [0013]According to a third embodiment of the invention, in an automatic transmission with at least five shift elements of which, for torque or force transfer in any forward gear and in a reverse gear, at least three shift elements are engaged and the other shift element are disengaged, while a first upshift or downshift and/or while a second subsequent upshift or downshift is being carried out, a torque of the drive motor is increased and/or decreased compared with a drive motor torque deduced from a driver's wish in order to assist in the overlapped implementation of successive upshifts or downshifts. [0014]The above three embodiments according to the invention can be used either alone or in a combination of two embodiments or in a combination of all three embodiments for the operation of a drivetrain. BRIEF DESCRIPTION OF THE DRAWINGS [0015]The invention will now be described, by way of example, with reference to the accompanying drawings in which: [0016]FIG. 1 is a drivetrain layout of a motor vehicle; [0017]FIG. 2 is a transmission layout of an automatic transmission of the drivetrain with five shift elements; [0018]FIG. 3 is a shift element matrix for the shift elements of the transmission layout in FIG. 2, to indicate which shift elements are engaged in which gear; [0019]FIG. 4 is a first diagram to aid in understanding the method, according to the invention, for operating a drivetrain of a motor vehicle, which comprises an automatic transmission, according to FIGS. 2 and 3; [0020]FIG. 5 is a second diagram to aid in understanding the method according to the invention, for operating a drivetrain of a motor vehicle, which comprises an automatic transmission, according to FIGS. 2 and 3; Continue reading about Method for the operation of a drivetrain... Full patent description for Method for the operation of a drivetrain Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Method for the operation of a drivetrain patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Method for the operation of a drivetrain or other areas of interest. ### Previous Patent Application: Continuously variable transmission Next Patent Application: Method for the operation of a drivetrain Industry Class: Interrelated power delivery controls, including engine control ### FreshPatents.com Support Thank you for viewing the Method for the operation of a drivetrain patent info. 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